diff --git a/gcc/rust/util/rust-lang-item.cc b/gcc/rust/util/rust-lang-item.cc
index a76cc7ff651..9aff31b657c 100644
--- a/gcc/rust/util/rust-lang-item.cc
+++ b/gcc/rust/util/rust-lang-item.cc
@@ -118,6 +118,7 @@ const BiMap<std::string, LangItem::Kind> Rust::LangItem::lang_items = {{
 
   {"discriminant_kind", Kind::DISCRIMINANT_KIND},
   {"discriminant_type", Kind::DISCRIMINANT_TYPE},
+  {"manually_drop", Kind::MANUALLY_DROP},
 }};
 
 tl::optional<LangItem::Kind>
diff --git a/gcc/rust/util/rust-lang-item.h b/gcc/rust/util/rust-lang-item.h
index 8f3af3615bb..67a5d9c438f 100644
--- a/gcc/rust/util/rust-lang-item.h
+++ b/gcc/rust/util/rust-lang-item.h
@@ -150,6 +150,8 @@ public:
 
     DISCRIMINANT_TYPE,
     DISCRIMINANT_KIND,
+
+    MANUALLY_DROP,
   };
 
   static const BiMap<std::string, Kind> lang_items;